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Figure A1: The uppermost panel contains the results of five repeated measurements of the frequency response of the headphones (Sennheiser HD-650) measured in an anechoic chamber on an artificial head with adjustable ear canal length. The middle panel presents the average pressure division between the blocked ear canal entrance and the eardrum position for the headphones and for a reference loudspeaker. The bottom panel presents the ratio of the pressure divisions of the middle panel. See the text for details

Figure A1: The uppermost panel contains the results of five repeated measurements of the frequency response of the headphones (Sennheiser HD-650) measured in an anechoic chamber on an artificial head with adjustable ear canal length. The middle panel presents the average pressure division between the blocked ear canal entrance and the eardrum position for the headphones and for a reference loudspeaker. The bottom panel presents the ratio of the pressure divisions of the middle panel. See the text for details